batgrbproduct analysis for trigger=773893
batgrbproduct Analysis for Trigger=773893
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Sep 25 03:12:40 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger773893/GCN5_download_cron
======================================================================
Trigger: 00773893 Segment: 000
BAT Trigger Time: 527940616 [s; MET]
Trigger Stop: 527940680 [s; MET]
UTC: 2017-09-24T10:09:56.264440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.506813503219 Dec: -57.3563961699199 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.85
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.85
Flight Position: [ source = BAT ]
RA: 233.506813503219 Dec: -57.3563961699199 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.490602210264 Dec: -57.3465339787641 [deg; J2000]
{ 15h 33m 57.7s , -57d 20' 47.5" }
+/- 2.19880657349391 [arcmin] (estimated 90% radius based on SNR)
+/- 0.945389359761334 [arcmin] (formal 1-sigma fit error)
SNR: 9.86915046979544
Angular difference between Flight and Ground position is 0.790887 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.621933 0.453140 0.062308 0.062866
0.057559 0.057593 0.051830 0.054205 [error]
Peak 0.621933 0.453140 0.062308 0.062866
0.057559 0.057593 0.051830 0.054205 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.89e-07 1.61e-07 9.41e-08 8.19e-08 4.80e-07 5.27e-07 erg/cm2
Error 3.09e-08 3.06e-08 3.87e-08 6.29e-08 9.03e-08 1.25e-07 erg/cm2
Peak flux Power-law 9.91e-02 4.74e-02 1.38e-02 5.07e-03 1.63e-01 1.65e-01 ph/cm2/s
Error 1.67e-02 8.52e-03 5.50e-03 3.65e-03 2.25e-02 2.30e-02 ph/cm2/s
Fluence Cutoff-PL 1.89e-07 1.61e-07 9.32e-08 7.99e-08 4.79e-07 5.23e-07 erg/cm2
Error 3.09e-08 3.42e-08 6.80e-08 8.01e-08 1.03e-07 1.48e-07 erg/cm2
Peak flux Cutoff-PL 9.92e-02 4.73e-02 1.37e-02 4.96e-03 1.63e-01 1.65e-01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.779 0.381 - - 6.94e-04 2.10e-04 51.940 57
CPL 1.972 0.897 1.1 10.8 2.43e-03 0.00e+00 52.510 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.779 0.381 - - 6.94e-04 2.10e-04 51.940 57
CPL 1.972 0.897 1.1 10.8 2.43e-03 0.00e+00 52.510 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
233.4906 -57.3465 0.0194 16.5 15.2 1.1559 9.9 TRIG_00773893
------------------------------------------
Foreground time interval of the image:
0.000 4.230 (delta_t = 4.230 [sec])
5.000 64.000 (delta_t = 59.000 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 4.230000
5.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.77890 ( -0.353076 0.408891 )
Norm@50keV : 6.93743E-04 ( -0.000206024 0.000213243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9113 for 57 degrees of freedom
# Null hypothesis probability = 6.647471e-01
Photon flux (15-150 keV) in 63.23 sec: 0.163260 ( -0.0224459 0.0224708 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.80265e-07 ( -8.69811e-08 9.37126e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 4.230000
5.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97208 ( -1.74255 0.0522898 )
Epeak [keV] : 1.08811 ( -0.588483 21.0914 )
Norm@50keV : 2.43279E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9377 for 56 degrees of freedom
# Null hypothesis probability = 6.077095e-01
Photon flux (15-150 keV) in 63.23 sec: 0.163222 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79315e-07 ( -1.12221e-07 9.44536e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 4.230000
5.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.27329 ( 7.27329 7.27329 )
beta : -2.77890 ( -0.408839 0.352997 )
Epeak [keV] : 9.88749 ( -9.88749 -9.88749 )
Norm@50keV : 9.42893E-02 ( -0.0280015 0.0289827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9444 for 55 degrees of freedom
# Null hypothesis probability = 5.921757e-01
Photon flux (15-150 keV) in 63.23 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.25374 (-0.990632 1.07586)
R^2/D10^2 : 0.482334 (-0.238388 0.545539)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.630573e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.678e-07 4.142e-08
25- 50 1.829e-07 5.106e-08
50-150 1.979e-08 1.129e-08
15-150 3.705e-07 7.686e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.2620 (-6.34506 9.81773)
Norm : 1.72195 (-0.535439 0.87985)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9344 for 57 degrees of freedom
# Null hypothesis probability = 6.161580e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.839e-07 3.443e-08
25- 50 1.743e-07 3.965e-08
50-150 6.215e-08 3.767e-08
15-150 4.204e-07 9.001e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.28517 (-1.0794 1.44286)
R1^2/D10^2 : 48.3708 (-52.1232 21042.6)
kT2 [keV] : 8.13257 (-1.62191 2.80413)
R2^2/D10^2 : 0.127996 (-0.0961385 0.239668)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.59 using 59 PHA bins.
# Reduced chi-squared = 0.9198 for 55 degrees of freedom
# Null hypothesis probability = 6.437558e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.831e-07 9.051e-08
25- 50 1.807e-07 1.019e-07
50-150 4.887e-08 3.218e-08
15-150 4.126e-07 2.101e-07
Peak spectrum fit
Power-law model
Time interval is from 5.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.77890 ( -0.353076 0.408891 )
Norm@50keV : 6.93743E-04 ( -0.000206024 0.000213243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9113 for 57 degrees of freedom
# Null hypothesis probability = 6.647471e-01
Photon flux (15-150 keV) in 63.23 sec: 0.163260 ( -0.0224459 0.0224708 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.80265e-07 ( -8.69811e-08 9.37126e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97208 ( -1.74255 0.0522898 )
Epeak [keV] : 1.08811 ( -0.588483 21.0914 )
Norm@50keV : 2.43279E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9377 for 56 degrees of freedom
# Null hypothesis probability = 6.077095e-01
Photon flux (15-150 keV) in 63.23 sec: 0.163222 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79315e-07 ( -1.12221e-07 9.44536e-08 ) ergs/cm2
Band function
Time interval is from 5.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.27329 ( 7.27329 7.27329 )
beta : -2.77890 ( -0.408839 0.352997 )
Epeak [keV] : 9.88749 ( -9.88749 -9.88749 )
Norm@50keV : 9.42893E-02 ( -0.0280015 0.0289827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9444 for 55 degrees of freedom
# Null hypothesis probability = 5.921757e-01
Photon flux (15-150 keV) in 63.23 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.25374 (-0.990632 1.07586)
R^2/D10^2 : 0.482334 (-0.238388 0.545539)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.630573e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.678e-07 3.740e-08
25- 50 1.829e-07 4.584e-08
50-150 1.979e-08 1.117e-08
15-150 3.705e-07 8.049e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.2620 (-6.34506 9.81773)
Norm : 1.72195 (-0.535439 0.87985)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9344 for 57 degrees of freedom
# Null hypothesis probability = 6.161580e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.839e-07 3.484e-08
25- 50 1.743e-07 4.546e-08
50-150 6.215e-08 3.602e-08
15-150 4.204e-07 8.814e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.28517 (-1.0794 1.44286)
R1^2/D10^2 : 48.3708 (-52.1232 21042.6)
kT2 [keV] : 8.13257 (-1.62191 2.80413)
R2^2/D10^2 : 0.127996 (-0.0961385 0.239668)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.59 using 59 PHA bins.
# Reduced chi-squared = 0.9198 for 55 degrees of freedom
# Null hypothesis probability = 6.437558e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.831e-07 9.443e-08
25- 50 1.807e-07 1.027e-07
50-150 4.887e-08 3.234e-08
15-150 4.126e-07 2.094e-07
Plot creation:
Mon Sep 25 03:36:07 EDT 2017